Bugzilla – Bug 1005645
VUL-0: CVE-2016-8623: curl: Use-after-free via shared cookies
Last modified: 2019-05-29 07:21:16 UTC
Use-after-free via shared cookies ================================= Project cURL Security Advisory, November 2, 2016 - [Permalink](https://curl.haxx.se/docs/adv_20161102I.html) VULNERABILITY ------------- libcurl explicitly allows users to share cookies between multiple easy handles that are concurrently employed by different threads. When cookies to be sent to a server are collected, the matching function collects all cookies to send and the cookie lock is released immediately afterwards. That funcion however only returns a list with *references* back to the original strings for name, value, path and so on. Therefore, if another thread quickly takes the lock and frees one of the original cookie structs together with its strings, a use-after-free can occur and lead to information disclosure. Another thread can also replace the contents of the cookies from separate HTTP responses or API calls. We are not aware of any exploit of this flaw. INFO ---- The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2016-XXXX to this issue. AFFECTED VERSIONS ----------------- This flaw exists in the following curl versions: - Affected versions: curl 7.10.7 to and including 7.50.3 - Not affected versions: curl < 7.10.7 and curl >= 7.51.0 libcurl is used by many applications, but not always advertised as such! THE SOLUTION ------------ In version 7.51.0, the function returning the cookies make deep copies. A [patch for CVE-2016-XXXX](https://curl.haxx.se/s3c/I.patch) is available. RECOMMENDATIONS --------------- We suggest you take one of the following actions immediately, in order of preference: A - Upgrade curl and libcurl to version 7.51.0 B - Apply the patch to your version and rebuild C - Do not share cookies between threads TIME LINE --------- It was first reported to the curl project on September 23 by Cure53. We contacted distros@openwall on October 19. curl 7.51.0 was released on November 2 2016, coordinated with the publication of this advisory. CREDITS ------- his vulnerability was found during a Secure Open Source audit performed by Cure53.
From: Daniel Stenberg We intend to publish the advisories, the patches and announce the new release (7.51.0) with all of these problems fixed on November 2nd. CRD: 2016-11-02
bugbot adjusting priority
SUSE-SU-2016:2699-1: An update that fixes 11 vulnerabilities is now available. Category: security (important) Bug References: 1005633,1005634,1005635,1005637,1005638,1005640,1005642,1005643,1005645,1005646,998760 CVE References: CVE-2016-7167,CVE-2016-8615,CVE-2016-8616,CVE-2016-8617,CVE-2016-8618,CVE-2016-8619,CVE-2016-8620,CVE-2016-8621,CVE-2016-8622,CVE-2016-8623,CVE-2016-8624 Sources used: SUSE Linux Enterprise Software Development Kit 12-SP1 (src): curl-7.37.0-31.1 SUSE Linux Enterprise Server 12-SP1 (src): curl-7.37.0-31.1 SUSE Linux Enterprise Desktop 12-SP1 (src): curl-7.37.0-31.1
SUSE-SU-2016:2700-1: An update that fixes 13 vulnerabilities is now available. Category: security (important) Bug References: 1005633,1005634,1005635,1005637,1005638,1005642,1005645,1005646,997420,998760 CVE References: CVE-2016-5420,CVE-2016-7141,CVE-2016-7167,CVE-2016-8615,CVE-2016-8616,CVE-2016-8617,CVE-2016-8618,CVE-2016-8619,CVE-2016-8620,CVE-2016-8621,CVE-2016-8622,CVE-2016-8623,CVE-2016-8624 Sources used: SUSE Studio Onsite 1.3 (src): curl-7.19.7-1.20.47.2
SUSE-SU-2016:2714-1: An update that fixes 11 vulnerabilities is now available. Category: security (important) Bug References: 1005633,1005634,1005635,1005637,1005638,1005642,1005645,1005646,998760 CVE References: CVE-2016-7167,CVE-2016-8615,CVE-2016-8616,CVE-2016-8617,CVE-2016-8618,CVE-2016-8619,CVE-2016-8620,CVE-2016-8621,CVE-2016-8622,CVE-2016-8623,CVE-2016-8624 Sources used: SUSE Linux Enterprise Software Development Kit 11-SP4 (src): curl-7.19.7-1.64.1 SUSE Linux Enterprise Server 11-SP4 (src): curl-7.19.7-1.64.1 SUSE Linux Enterprise Server 11-SECURITY (src): curl-openssl1-7.19.7-1.64.1 SUSE Linux Enterprise Debuginfo 11-SP4 (src): curl-7.19.7-1.64.1
An update workflow for this issue was started. This issue was rated as moderate. Please submit fixed packages until 2016-11-18. When done, reassign the bug to security-team@suse.de. https://swamp.suse.de/webswamp/wf/63187
openSUSE-SU-2016:2768-1: An update that fixes 11 vulnerabilities is now available. Category: security (important) Bug References: 1005633,1005634,1005635,1005637,1005638,1005640,1005642,1005643,1005645,1005646,998760 CVE References: CVE-2016-7167,CVE-2016-8615,CVE-2016-8616,CVE-2016-8617,CVE-2016-8618,CVE-2016-8619,CVE-2016-8620,CVE-2016-8621,CVE-2016-8622,CVE-2016-8623,CVE-2016-8624 Sources used: openSUSE Leap 42.1 (src): curl-7.37.0-16.1
released